FreeTube/static/pwabuilder-sw.js

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2020-04-14 04:59:25 +02:00
// This is the service worker with the Advanced caching
const CACHE = 'pwabuilder-adv-cache'
const precacheFiles = [
/* Add an array of files to precache for your app */
'index.html',
'web.js',
'web.css',
'static/*',
'_icons/*',
'fonts/*'
]
// TODO: replace the following with the correct offline fallback page i.e.: const offlineFallbackPage = "offline.html";
const offlineFallbackPage = 'index.html'
const networkFirstPaths = [
/* Add an array of regex of paths that should go network first */
// Example: /\/api\/.*/
]
const avoidCachingPaths = [
/* Add an array of regex of paths that shouldn't be cached */
// Example: /\/api\/.*/
]
function pathComparer(requestUrl, pathRegEx) {
return requestUrl.match(new RegExp(pathRegEx))
}
function comparePaths(requestUrl, pathsArray) {
if (requestUrl) {
for (let index = 0; index < pathsArray.length; index++) {
const pathRegEx = pathsArray[index]
if (pathComparer(requestUrl, pathRegEx)) {
return true
}
}
}
return false
}
self.addEventListener('install', function (event) {
console.log('[PWA Builder] Install Event processing')
console.log('[PWA Builder] Skip waiting on install')
self.skipWaiting()
event.waitUntil(
caches.open(CACHE).then(function (cache) {
console.log('[PWA Builder] Caching pages during install')
return cache.addAll(precacheFiles).then(function () {
if (offlineFallbackPage === 'ToDo-replace-this-name.html') {
return cache.add(new Response('TODO: Update the value of the offlineFallbackPage constant in the serviceworker.'))
}
return cache.add(offlineFallbackPage)
})
})
)
})
// Allow sw to control of current page
self.addEventListener('activate', function (event) {
console.log('[PWA Builder] Claiming clients for current page')
event.waitUntil(self.clients.claim())
})
// If any fetch fails, it will look for the request in the cache and serve it from there first
self.addEventListener('fetch', function (event) {
if (event.request.method !== 'GET') return
if (comparePaths(event.request.url, networkFirstPaths)) {
networkFirstFetch(event)
} else {
cacheFirstFetch(event)
}
})
function cacheFirstFetch(event) {
event.respondWith(
fromCache(event.request).then(
function (response) {
// The response was found in the cache so we responde with it and update the entry
// This is where we call the server to get the newest version of the
// file to use the next time we show view
event.waitUntil(
fetch(event.request).then(function (response) {
return updateCache(event.request, response)
})
)
return response
},
function () {
// The response was not found in the cache so we look for it on the server
return fetch(event.request)
.then(function (response) {
// If request was success, add or update it in the cache
event.waitUntil(updateCache(event.request, response.clone()))
return response
})
.catch(function (error) {
// The following validates that the request was for a navigation to a new document
if (event.request.destination !== 'document' || event.request.mode !== 'navigate') {
return
}
console.log('[PWA Builder] Network request failed and no cache.' + error)
// Use the precached offline page as fallback
return caches.open(CACHE).then(function (cache) {
cache.match(offlineFallbackPage)
})
})
}
)
)
}
function networkFirstFetch(event) {
event.respondWith(
fetch(event.request)
.then(function (response) {
// If request was success, add or update it in the cache
event.waitUntil(updateCache(event.request, response.clone()))
return response
})
.catch(function (error) {
console.log('[PWA Builder] Network request Failed. Serving content from cache: ' + error)
return fromCache(event.request)
})
)
}
function fromCache(request) {
// Check to see if you have it in the cache
// Return response
// If not in the cache, then return error page
return caches.open(CACHE).then(function (cache) {
return cache.match(request).then(function (matching) {
if (!matching || matching.status === 404) {
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return Promise.reject(new Error('no-match'))
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}
return matching
})
})
}
function updateCache(request, response) {
if (!comparePaths(request.url, avoidCachingPaths)) {
return caches.open(CACHE).then(function (cache) {
return cache.put(request, response)
})
}
return Promise.resolve()
}